java - How to calculate the angle between a place on Earth and the Sun? -

For my application, I need to calculate an angle between two different lines: < P> 1) The first line is between a point on the earth, which is defined by the longitude and latitude and the center of the sun.

2) The second line is between a point on the earth, which is defined by the longitude and the latitude and the surface, with the small distance from the Earth on the Moon.

I do not know how I should start there. Any signals?

Assuming that you actually have three digits of interest already calculated [*] , Where O is the position of the supervisor (on earth), S is the position of the sun and M is the point on the moon, then:

  ohm OS = | Om | * | OS |   
 Or, in other words,  to calculate the theta , move the dot product of two vectors,   
 [*] Your question only asks for angle between two rows - If you want to know instead how to calculate the actual lines of any moment of time then you should rewrite your question needed.